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# coding=utf-8
#
# Copyright © Cloud Linux GmbH & Cloud Linux Software, Inc 2010-2021 All Rights Reserved
#
# Licensed under CLOUD LINUX LICENSE AGREEMENT
# http://cloudlinux.com/docs/LICENCE.TXT
#
# pylint: disable=no-absolute-import
import logging
import os
import signal
from clcommon.utils import get_process_pid
from clwpos.daemon_config import load_config
logger = logging.getLogger(__name__)
class WposDaemonBase:
"""
AccelerateWP daemon base class. Signals, signal handlers, setup daemon logger, pid file operations
"""
_PID_FILENAME = "/var/run/clwpos_monitoring.pid"
def __init__(self):
self._reload_config_need = False
self._is_terminate = False
self._config = load_config()
logger.info("Cloudlinux AccelerateWP daemon uses monitoring interval: %d seconds",
self._config.monitoring_interval)
if not self._config.enable_reload_rate_limit:
logger.info("NOTE: Cloudlinux AccelerateWP daemon check reload interval is OFF by config")
logger.info("NOTE: Cloudlinux AccelerateWP daemon logging level=%s",
self._config.logging_level)
def _setup_signals(self):
"""
Setup daemon signal handlers
"""
# Setup SIGHUP signal handler for config reload
signal.signal(signal.SIGHUP, self._sighup_handler)
# Setup Ctrl-C signal handler. Used for console debug
signal.signal(signal.SIGINT, self._sigint_handler)
# Setup SIGTERM signal. Called when daemon stops
signal.signal(signal.SIGTERM, self._sigterm_handler)
def run(self):
"""
Main work daemon function (implement in child class)
"""
raise NotImplementedError()
def stop(self, *args, **kwargs):
"""
Stops a working daemon process (implement in child class)
"""
raise NotImplementedError()
def reload(self):
"""
Reload working daemon process by sending SIGHUP signal to it
"""
try:
pid = get_process_pid(self._PID_FILENAME)
if pid:
os.kill(pid, signal.SIGHUP)
except:
pass
def _sighup_handler(self, signum, frame):
"""
SIGHUP signal handler
"""
# Load new user configuration from config file
self._reload_config_need = True
logger.info("SIGHUP: Cloudlinux AccelerateWP daemon sheduled for reload")
def _sigint_handler(self, signum, frame):
"""
SIGINT (Ctrl-C) signal handler. For console debug
"""
logger.info("Ctrl-C received, exit")
# Terminate main cycle
self._is_terminate = True
def _sigterm_handler(self, signum, frame):
"""
SIGTERM signal handler. Called when daemon stopping
"""
# Terminate main cycle
self._is_terminate = True